Short Answer TypeWrite three distinct features of chemisorptions which are not found in physisorptions.
(i) Differentiate between adsorbtion and absorption.
(ii)Out of MgCl2 and AlCl3, which one is more effective in causing coagulation of negatively charged sol and why?
(iii)Out of sulphur sol and proteins, which one form multimolecular colloids?
Define the following terms:
i)Lyophilic colloid
ii) Zeta potential
iii) Associated colloids
Classify colloids where the dispersion medium is water. State their characteristics and write an example of each of these classes.
OR
Explain what is observed when
(i) An electric current is passed through a sol
(ii) A beam of light is passed through a sol
(iii) An electrolyte (say NaCl) is added to ferric hydroxide solWhat are emulsions? What are their different types? Give one example of each type.
Emulsions are the liquid−liquid colloidal systems, obtained on mixing two immiscible or partially miscible liquids.
There are two types of emulsions.
(1) Oil dispersed in the water type (O/W) : Here water is the dispersion medium, e.g. milk.
(2) Water dispersed in oil type (W/O) : Here oil is the dispersion medium, e.g. butter.
Write one difference in each of the following :
Homogeneous catalysis and Heterogeneous catalysis
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